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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37ef63a16ceb9ce7fa1ad3730ccd84b4ff8e303553fa67ccdf8e39b442b4bdb' 
  AND token = 'SdrnrLlPNU5qADYp8s5T13rQqs11pMV6QHlkm6HnCYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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