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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f632da14947e7e1da2965ea537e0d9dc4c482edb45528e8acf00e2b4b194d698' 
  AND token = 'b16mJosTI5NuRUd+t8fDL9AKGS4DeaLaFqToh1D39/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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