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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4da7a2bdca59129ef7da9b2f762027a7f85b7b90b3ff808a70d9d3d12c2088' 
  AND token = 'uRD7tDRFRe+QAtWKO8TfGYlYmfA6Ez4b6Kf7Ib/SzxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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