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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d62d0445f5efc7a9a988775b63e452ef09c85742eb2f95b04c0c49318c74705' 
  AND token = '/3iSr65SN5cKZ5n3TxS8g6vIksfX3ldmcS2r8zi86SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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