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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b0520525b08c85cc73545ce1a4e3d3a1ad72396a90a58a372829746e3289ea' 
  AND token = 'ofXfgvrHkbR75IMZuvCNlGPWyI/xWM1TfjLI/DQg5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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