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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f15a0203ba5241f9d49b05e318e16bbc05712f22c186ee98325477e203a5b70' 
  AND token = 'S7mUO0OtaHSIj3uGpRUxTobH3eeQO67Enh1SSH6RL38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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