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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30e8faca5e8df2327714c916d512d294c0fc1cf68c5775ac8af841ac0a15791' 
  AND token = 'yPOxkiBfvSp+ixJpX72tt5PKVwgCkqAmqZV1pq1LukM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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