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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebcd23d93678dc09f377a10cec8cf97c550b89f1da56fb2b28a1ccd4b2a1977' 
  AND token = '5ZUejsRtNunB8ju37UE8JL+c8GyBQnzq//dxZCvl8BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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