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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc0370ef14b80684a497c48e94cc64d25d27fd68dd8a4b68682409b2e55e150' 
  AND token = 's+/SMBWK1KOaaTLXWdksQZVFlVtbmHf5NNjs7RSNn2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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