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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aeff9dd14c44ce517ab4e06d611f1cba62d2717a34056fb3d74ace7ffc4b9d9' 
  AND token = 'iXM3Ti/gjJ265VqlWriq1j8rkOrXU9au/zlf+OFzMm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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