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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523d0bc1e13434a7cf21360584623a7fff95a6188d930fa2d4f5f1611ebcefc2' 
  AND token = 'w+rPVyMQ5gcKpe/HtZfocKkCa1y7H0QLRunrVTqeH4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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