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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ca3e9d37384cc0b4fb1a568031881a3fef83adca607a9a5f4a3892145fe3b6' 
  AND token = 'hXEPNDvYCsaE4Gj59R4T91ZVabo8C16vUXH4JDLUE2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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