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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13200d1df7e1acbef952decf0eab33f605ccc0ceda309a8a29a856401e97be0' 
  AND token = '2D3wi6L2nWJrrnFHSA6zDIufU9BfgR6bj9iw8IP0O3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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