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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bcebe116c1695fdf085ccd808afed9623bc636e69fec3477e6c3da7d1fb632' 
  AND token = 'i+WCBcox722w/4aPQbpgvb33/1Ise2M9Jd7akeKknjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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