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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0b831e9b9714044e09f0467bcdb4ef7febb12f577e671c7e48cc2b4da931b6' 
  AND token = 'mU32kZoj+YYME1M5U8tHCw7AJXRaiQLRILwG7oK8Rew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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