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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b75b3b6897045e96edf07af01b55dafb46933feab09c88d32a5450a75b0f58' 
  AND token = 'iHxOe/aCgce63XV+yGHaPLIO9k/rn4hEq1x2oJ9e+SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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