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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a170c8277756407ce924fa2d78b577edc0146360a785bd806522187d534358' 
  AND token = 'D0HTYl8pez6YY3/kUp41eC6NSnrCwvCKzS5FXIsAWRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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