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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1c631c4e91ae9899151777416ecd28aea7c8e60941c94a24bdf4ff895fad6c' 
  AND token = 'sBINw9V2/m/APS5K0ryFdl217yUzC7Uz5ejNHW1VMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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