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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20e219ec86b317acca1893eb7918de01f8b381af5c48ce4177423d1eb739ff4' 
  AND token = 'swXzx4OjEiRGtUS8AtXvq+R+Apm0Dv1RRCy8nQRGqqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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