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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79281b128794fba4ef4d01237346e39792db285fbe46e16e263b49fbf6e0f96c' 
  AND token = 'J0mAJz9nktQ/fDgEIopeLyDY/RlmFwLMZCRDemPfFQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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