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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4819d5bd1cef8aed221b3ef07e77fe8798b74abcc1ebb6697b83e9c13029505' 
  AND token = 'C+7av0bqGIf74TZjlFQxYhE3PYRjrXt4jyLBambwctk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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