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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc98eef88fb04d191485cb53d3c1263735e00946e9a44866818613f706140b63' 
  AND token = 'fP2CQ6/Ne6W/KY0OtLiz5mh8UtciLA92kiqkhje1QFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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