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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850f776fda7a967ee6d598022eefd3739ae96211cf09f3ceb20298682dbc9975' 
  AND token = 'v8IyKXX2bBAAqp7LHelQnCZaBKfOPmYuL33b+lQIpF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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