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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a13b6ad83df1f2833760a248562467f35baf31b1f52c15dc07638a52d711ea' 
  AND token = 'bDY4GYLnhAL/79DpYLcl83piBf3iRivavCR8LLDvKaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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