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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d1152346ae908eaf59dcb79fd6642e5435eabcc27002144d4d32c4a930db3d' 
  AND token = '1i26ydKb1hAsaflnq6oTuKjT/K66oQfLks7p1JjCyl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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