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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b194cc4c5f8486710181076bbd43ead8a3b49240bac458710007b19d5291b86d' 
  AND token = 'pDCa9JOhhkBYux/jaM9eTZNkMmh+z965/m59Iu/dPkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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