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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0025f171074fac3b22197af0f9114f0e0af76427e3759028dc1b4be17b4a01' 
  AND token = 'bWGNUNLl23vgLUF8IpGSmGUuvEiufPtBTYClSLEVgrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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