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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9bf24447b5116ebd7f9a931c5caa78c19444c1647c5f024b576034f743f71b' 
  AND token = 'II9J9e5Uw9efWhmDu+c5Cdt5ihunDo2/TU74iv1+rCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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