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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf05387bb2ca3ab647d458d0577ae3cd9f9acb0076eb3eafe97a7dfd007a943' 
  AND token = '15qxJYPi38krHr5ol92kJ5M3120+niaposKYeno8mac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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