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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61ac347b16a78bb0b2915dfc6f50605b34d1dce830105c4da91c57ebc66a981' 
  AND token = 'IceaAB10cIsaJacFTJuQcX+bJCaZ0kBz03c47mMBErY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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