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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ff6ba4175c880bb107cea78ebee5ad1d933b36394e261c03967deaa0670804' 
  AND token = '1Knl6v0u+tmZPcDcmuWZgvR2PRRdv8kfSsAAJPpksd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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