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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0809ed65921fb76ccd39f8ce3e2fec3a822dcd83d7a1820424e8703123a2bc2b' 
  AND token = 'v46d7Y3vvMW2evDc8erlUbcJU8VdN1c+nwXWHV6in8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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