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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4fe0b342f289d5255616b3fc2e7b1173fd75703c12cb029724cdd6ff0a76ce' 
  AND token = '0KyTAUsGf0J+HjclgA1gc1tby2Ar1pj+sohUJRcnwIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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