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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce8763cbe8e7cb0dfc16f146c2cc2c443c921b958549304044a5829681f0ebc' 
  AND token = 'zd1OidKQ6CQLrt6CEyioFruv1D+wyFsgOBRYF3pssLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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