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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcf79e82ba08e2565418a7f0dd1f0c9ad4f7d0a33a68dd0b7af5330348721e0' 
  AND token = 'B+XstLN0LkDanXOMzH8uvF27rXEvb/FduFxN2G0M0YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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