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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e7d50d2e0e336ee3ed6ffe647663f4235c2de64dc62dca62151ef9ec75380' 
  AND token = 'ZYryZid1c3L1744N8CfaZ16rAvs+a+gGtMIBa/LzMEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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