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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbeaf974d0003cdeef1067a646c1f03ff2836fd192f47b47d27d4954c99aeb86' 
  AND token = 'VBRWm+SGSOd0NRtsOhFsoR56LjN9H09zHY0l4T24DWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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