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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae9245d39d20d4bc032b1639200916bd43699f3a96533f1f9b030eeb155e0e0' 
  AND token = 'whdwTvAKWFykV4EsBHRcWKvjqzVitRWDPl6YAew1MGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}