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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc87f7c2a237a3a9917b36774afd501f138c242ca337341fefe4e5707b089806' 
  AND token = 'Q4W7qbYAIDbA+JOeDwSCf/O/qVJ0Hl+iM1ilbAxtTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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