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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c808656748036ec9e2943ae943bc335e574df25e3d8f5b6472f87a8c42fdce1' 
  AND token = 'cCfr3rHNMU60NKMIagB6muh4gfpXDhYrREx08bh9S/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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