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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa748a3a1e6659eb93622e6bf46d18f57be03fc880145d8fe3516b79c83c5c8d' 
  AND token = 'fhBD0PgSVr2zPHtB2cfa54m/j9tCtRWrkyBGvWin2tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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