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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb289161d895fd52d322444031994d8ae9d2c96c7ceb8d270120e66a0d892ac' 
  AND token = 'r+G0keAs2wTe6dCOZitjYMBV3ZKBK8t4XsaeGDIhNzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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