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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00bdec6daef871637dbea71fe5b0065f6d91df9ced32756be70795dffa1d039' 
  AND token = 'ciUzuJdbFAPy2S1G9uMbK9DZJtQaPfWG/yMB6rHOBso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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