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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272f233602c7fc08b7d4c78b39ccf5e3ee36e045feb63c939ade9e79efd5ef22' 
  AND token = 'Gg00ply/8nh5+hczjQEFnvv5yRf4xf33RYWOGALcpwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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