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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a18d3bec63f7c604ba155b09e9303f48e7ca9ffb82f25c9565f285ea744453' 
  AND token = 'mcSxN/o+XYKrIHmg3WpvUix7gZu0R/xKK2icIkhcudU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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