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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b703c7c1bd375da5e870ba0681a27ea75f30ea71b65501b04d3c3ee0c4ad3124' 
  AND token = 'p+D9ft78S8lpWVFyPwgkhhtVT1Q3/4sRsP5webXe3Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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