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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cecd5c7fa6508e8ad13e0b3e29590138f2d7a106b860ee06d33cc7417e9cb81' 
  AND token = 'g9zOtqj0SdByZ7rOsX9z2+Sn2UlENGoMwx8+hTncpOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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