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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9584041084f8f516567b701a834eac21ec5643be34c996a22c9894787eb7dfc' 
  AND token = 'Y6Vb2IaKav8tYgb7yyabRbm88jeN8wVkouMm08XqRZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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