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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d80ff4c48c22ce7bad095af74027bee000b22f43607f09495b7566534b3520' 
  AND token = 'R2n2jc97BOAJOPbrS5cWYPJMHGxdhQp8Xk+L0QQwn2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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