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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90340575f17c1d60be0dae94a920440c0b71f3748cefb79c88d6606f0fa7ab26' 
  AND token = 'd0njKeJte2DjjWCpBHpTQigv7ZcaDXPlCE1v0Of4u0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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