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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abbb40100a912123f7a81cef581caea0d571d9e80b9d7c1edda1417c4ec941b' 
  AND token = 'Yn0Q7JuiNueduTLD4hZCPIGZ/teamaUaLyR2mnJ81Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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