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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc24f7984a217eec40d5d4c5aa79763a3143b9208f1453a9ca804797500a99cb' 
  AND token = 'DT4gIThwU3rprYfH2eLAfD8OBJwFQtEOEdQXV89XS74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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