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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c714ba7530f6613ece6d2e8f04347e727acd5fe91b79b3112916469b6118e1' 
  AND token = '6o8K0CNTpuHMbb5/MD9fuEr+wJdVhy+wX2yBwymwOYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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