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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562f56785319f89d66db9f0df5331194115a67ee05b49366b08ef4fdc07e095e' 
  AND token = 'Gx1nrNrn335cIp2TehdPcjMBlVwaszNoOebcvy+tP6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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