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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe2ae1e80c0363b999738a00cac6ba1f10b3228bb83dbb4763ec85f80f77160' 
  AND token = '/J8aAgPIP4wHza78uWlzciy2lEXifMuA9rYWOs2qmq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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