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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f509ef4c0b413276e215772a30458f7cd98dd031958c73ce24d5f27d42a9be37' 
  AND token = 'cftNlSHyhSZ7IWn5yaP588Ls4SDAQ6t5v0Q+WUGctZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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