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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0954931f938a7c3821739f820bcecb28190a90efc2d3cbd928c1c0971c8df8df' 
  AND token = 'USq2od0yaJ8pE4BNPOxvY13bHXFEhB5JzKpJ9BiPhKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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