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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a8f0f433ce2ff28e02928f82fcac631796d14043e3d0049ccd12c532717919' 
  AND token = 'oBMdXbQ07epnjiQHE6+lftipS6h5PB1ztnSuo1Zx+mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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