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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bbbe6c1710e05086de5933ef728f2d4a6067a81f41d7d7dcd63e3fb9cb548b' 
  AND token = 'ku84tY/qx90r1lEGk3iy5GCElbc0jtLg4RzXJvTGuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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